Date: Wed, 11 Oct 2000 17:32:43 -0700 From: Dan Yergeau <yergeau@gloworm.Stanford.EDU> To: Wesley Morgan <morganw@chemicals.tacorp.com> Cc: freebsd-mobile@freebsd.org, yergeau@gloworm.Stanford.EDU Subject: Re: FW: Linksys 10/100 PCMCIA card Message-ID: <200010120032.RAA18755@gloworm.Stanford.EDU> In-Reply-To: Your message of "Wed, 11 Oct 2000 18:14:50 -0400." <Pine.BSF.4.21.0010111812130.93169-100000@volatile.chemicals.tacorp.com>
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AFAICT, pccardd uses the free IRQ pool information specified in
/etc/defaults/pccard.conf, /etc/pccard.conf, or via the "-I"
argument to pccardd. It does not query
the kernel for conflicts. I don't even think that there is a way
for a user-level program to query the kernel to see which IRQ's have
been assigned to any device, but I'm not a kernel hacker.
The code for IRQ selection in
/usr/src/usr.sbin/pccard/pccardd/cardd.c:assign_driver() is
/* Allocate a free IRQ if none has been specified */
if (conf->irq == 0) {
int i;
for (i = 1; i < 16; i++)
if (pool_irq[i]) {
conf->irq = i;
pool_irq[i] = 0;
break;
}
if (conf->irq == 0) {
logmsg("Failed to allocate IRQ for %s\n", cp->manuf);
return (NULL);
}
}
In any case, ensuring that there aren't IRQ conflicts seems to be
currently left up to the user. This is discussed in the old PAO FAQ
(http://www.jp.FreeBSD.org/PAO/) and in messages in the
freebsd-mobile archives. It just doesn't appear to be mentioned
loud enough in the documentation.
Dan
>Just some input -- I found that my PCMPC100v2 card was continually
>assigned an irq that did not work, thus i was forced for manually
>configure it based on the settings it was given under windows. I guess
>that the OS does not test for irq conflicts with the other subsystems (in
>my case it was conflicting with the built-in modem).
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